Dataset: MOCNESS_tabs
Deployment: EN487

MOCNESS Summary Data from Gulf of Maine Krill Cruises

Principal Investigator:

Gareth Lawson (Woods Hole Oceanographic Institution, WHOI)

Co-Principal Investigator:

Peter H. Wiebe (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Biological and Physical Determinants of Euphausiid Aggregation, Behavior, and Interaction with Higher Predators at an Abrupt Topographical Feature in the Gulf of Maine (Krill GoME)

Version:

8 April 2011

Deployment Synonyms:

Krill

Version Date:

2011-04-08

Data URL:

https://www.bco-dmo.org/dataset-deployment/454516/data

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Description

Summary of environmental data collected by the MOCNESS system's (1 meter-square) electronics package.

Methods & Sampling

Dataset acquisition description

Data Processing Description

Dataset Processing Description

Nov. 29, 2010:
Revised MOCNESS files for recomputed volumes using new flow meter calibration value determined on R/V Connecticut and R/V Endeavor (EN487). See write-up decribing the calibration procedure in EN487 cruise report. The volume revisions were done by Peter Wiebe using a flow meter calibration value of 6.41, which was the average of the values determined on the two cruises. The following is a list of the files used (raw) and produced (pro, tab) to compute the volumes filtered.

Date revised Raw file Used New Pro file New Tab file
R/V Endeavor (EN484) Tows:
17Nov2010 M_01_1.raw    M001.pro M001.tab
17Nov2010 M_1_002.raw    M002.pro M002.tab
17Nov2010 M_01_003.raw M003.pro M003.tab
Note: M_1_004.raw modified to eliminate extra headers due to restarts before tow actually started.
17Nov2010 M_1_004.raw    M004.pro    M004.tab

R/V Endeavor (EN487) Tows:
17Nov2010 M_1_1.raw M001.pro M001.tab
17Nov2010 M_1_002.raw    M002.pro        M002.tab
17Nov2010 M_01_003.raw M003.pro M003.tab
  Note: M_1_004.raw modified to eliminate extra lines at start of tow.
17Nov2010 M_1_004.raw    M004.pro M004.tab
17Nov2010 M_01_005.raw M005.pro M005.tab

R/V Connecticut tows:
18Nov2010 - modified M_01_002.raw to eliminate start and end data when net out of the water and also removed the "#increment_net" indicator for net 2 because it apparently did not open at the 600 m mark. Net 8 was opened at the surface and taking out this indicator provides the volumes for the towing scenario indicated on the log sheets.
18Nov2010 M_1_002.raw    M002.pro M002.tab
18Nov2010 - modified M_01_003.raw to eliminate end data when net out of the water and also modifed the "#increment_net" indicator in all cases so that the postprocessing would ignore the indicator. In addition all of the "+" indicators were changed to "-" to prevent spurious net number changes in the raw file from indicating a net bar had been dropped except that a "+" was added at the end of the raw file along with an "#increment_net" indicator to make the program calculate the total volume filtered for the tow. This was done because none of the nets were opened or closed on the tow. See log notes for additional details.
18Nov2010 M_1_003.raw    M003.pro M003.tab
18Nov2010 - modified M_01_005 to eliminate end data when net out of the water and a "+" was added at the end of the raw file along with an "#increment_net" indicator to make the program calculate the total volume filtered for the third net that was not closed at the surface.
18Nov2010 M_1_005.raw    M005.pro M005.tab
18Nov2010 M_01_006.raw M006.pro M006.tab
18Nov2010 M_01_006.raw M007.pro M007.tab
18Nov2010 M_01_008.raw M008.pro M008.tab
18Nov2010 - modified M_01_009 to eliminate 2nd header that was present becuase program had to be restarted during net 8 open.
18Nov2010 M_1_009.raw M009.pro M009.tab
18Nov2010 - modified M_01_012 by modifying the "#increment_net" indicator so that it would be ignored since a delayed net response took place after it was issued for end of net 8.
18Nov2010 M_1_012.raw M012.pro M012.tabto be restarted during net 8 open.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0928801	NSF Division of Ocean Sciences

Instruments

MOCNESS1

Supplied Description:

Instrument Type

Generic Name: MOCNESS1

Acronym: MOC1

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0097/

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System or MOCNESS is a family of net systems based on the Tucker Trawl principle. The MOCNESS-1 carries nine 1-m2 nets usually of 335 micrometer mesh and is intended for use with the macrozooplankton. All nets are black to reduce contrast with the background. A motor/toggle release assembly is mounted on the top portion of the frame and stainless steel cables with swaged fittings are used to attach the net bar to the toggle release. A stepping motor in a pressure compensated case filled with oil turns the escapement crankshaft of the toggle release which sequentially releases the nets to an open then closed position on command from the surface. -- from the MOCNESS Operations Manual (1999 + 2003).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
tow	tow number		tow
lat_start	latitude start of MOCNESS cast, negative = South	DD.D	lat_start
lon_start	longitude start of MOCNESS cast, negative = West	DDD.D	lon_start
depth_w	depth of water, seafloor depth from the shipboard 12kHz Knudsen echosounder; seafloor in eventlog	meters	depth_w
net	MOCNESS net number, (0-8)		net
yrday_local	year day as a decimal, based on Julian calendar, local time	YYY.Y	yrday_local
num_obs	number of observations		numb_obs
vol_filt	volume filtered	meters^3	vol_filt
press	depth of observation or sample	psi	press
temp	temperature of water	degrees C	temp
potemp	potential temperature or theta	degrees C	potemp
sal	salinity calculated from conductivity		sal
sigma_0	potential density	kg/m^3	sigma_0
angle	angle of net frame relative to vertical (0-89 degrees)	degrees	tow_angle
hzvel	horizontal net velocity	m/min	hzvel
vtvel_min	Minimum vertical net velocity for each net measured during mocness tows.	m/min	vtvel
press_avg	average pressure for a net sample	psi	press
angle_min	Minimum angle of tow body relative to vertical (0-89 degrees), used in BIOMAPER-II and MOCNESS systems.	degrees	tow_angle
angle_max	Maximum angle of tow body relative to vertical (0-89 degrees), used in BIOMAPER-II and MOCNESS systems.	degrees	tow_angle
angle_avg	Angle of tow body relative to vertical (0-89 degrees), used in BIOMAPER-II and MOCNESS systems. Average is the mean of all observations, not just the mean of the global minimum and maximum.	decimal degrees	tow_angle
hzvel_min	Minimum horizontal net velocity, reported as meters per minute, used in MOCNESS system.	m/min	hzvel
hzvel_max	Maximum horizontal net velocity, reported as meters per minute, used in MOCNESS system.	m/min	hzvel
hzvel_avg	Average horizontal net velocity, reported as meters per minute, used in MOCNESS system. Average is the mean of all observations, not just the mean of the global minimum and maximum.	m/min	hzvel
potemp_min	Minimum potential temperature (International Practical Temperature Scale - 68 ,or 90. When known, the scale will be reported in the units field of the documentation file.	degrees Celsius	potemp
potemp_max	Maximum potential temperature (International Practical Temperature Scale - 68 ,or 90. When known, the scale will be reported in the units field of the documentation file.	degrees Celsius	potemp
potemp_avg	Average potential temperature (International Practical Temperature Scale - 68 ,or 90. When known, the scale will be reported in the units field of the documentation file. Average is the mean of all observations, not just the mean of the global minimum and maximum.	degrees Celsius	potemp
press_min	Minimum water pressure at measurement; depth reported as pressure; positive number increasing with water depth.	psi	press
press_max	Maximum water pressure at measurement; depth reported as pressure; positive number increasing with water depth.	psi	press
sal_min	Minimum salinity calculated from conductivity.	dimmensionless	sal
sal_max	Maximum salinity calculated from conductivity.	dimmensionless	sal
sal_avg	Average salinity calculated from conductivity. Average is the mean of all observations, not just the mean of the global minimum and maximum.	dimmensionless	sal
sigma_0_min	Minimum potential density.	kilograms/meter^3	sigma_0
sigma_0_max	Maximum postential density.	kilograms/meter^3	sigma_0
sigma_0_avg	Average potential density. Average is the mean of all observations, not just the mean of the global minimum and maximum.	kilograms/meter^3	sigma_0
vtvel_max	Maximum vertical net velocity for each net measured during mocness tows.	m/min	vtvel
vtvel_avg	Average vertical net velocity for each net measured during mocness tows. Average is the mean of all observations, not just the mean of the global minimum and maximum.	m/min	vtvel
temp_min	Minimum water temperature for each net measured during mocness tows.	degrees Celsius	temp
temp_max	Maximum water temperature for each net measured during mocness tows.	degrees Celsius	temp
temp_avg	Average water temperature for each net measured during mocness tows. Average is the mean of all observations, not just the mean of the global minimum and maximum.	degrees Celsius	temp
cruiseid	Cruise identifier (e.g. EN484 = R/V Endeavor cruise 484).	unitless	cruiseid

Database

Contribute Data

Dataset: MOCNESS_tabs
Deployment: EN487

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: MOCNESS_tabsDeployment: EN487

Dataset acquisition description

Dataset Processing Description

Dataset: MOCNESS_tabs
Deployment: EN487